The structure of the piston pump
1. When using an inflator, connect its outlet tube to the valve of the bicycle tire. The function of the valve is to only allow air to enter the tire from the inflator, and not allow air to flow from the tire into the inflator.
2. There is a gap between the piston of the pump and the cylinder wall, and there is a rubber bowl on the piston. When the piston is pulled up, the air volume under the piston increases and the pressure decreases, and the air above the piston is removed from the rubber Squeeze all around the bowl to the bottom
3. When the piston is pressed down, the volume of air under the piston is reduced and the pressure is increased, so that the rubber bowl is pressed against the cylinder wall to prevent air from leaking to the top of the piston
4. Continue to press the piston down, when the air pressure is enough to push the tire valve core, the compressed air will enter the tire
5. At the same time, the air outside the cylinder enters above the piston from the gap at the upper end of the cylinder
2. There is a gap between the piston of the pump and the cylinder wall, and there is a rubber bowl on the piston. When the piston is pulled up, the air volume under the piston increases and the pressure decreases, and the air above the piston is removed from the rubber Squeeze all around the bowl to the bottom
3. When the piston is pressed down, the volume of air under the piston is reduced and the pressure is increased, so that the rubber bowl is pressed against the cylinder wall to prevent air from leaking to the top of the piston
4. Continue to press the piston down, when the air pressure is enough to push the tire valve core, the compressed air will enter the tire
5. At the same time, the air outside the cylinder enters above the piston from the gap at the upper end of the cylinder